Ill. Admin. Code tit. 77, 890, Subpart M, Appendix A H

Current through Register Vol. 48, No. 25, June 21, 2024

Table H - Horizontal Fixture Branches and Stacks

Maximum Number of Drainage Fixture Units (D.F.U.) That May be Connected to:
More than 3 Stories in Height
Diameter of Pipe (inches)	Any Horizontal Fixture Branch	One Stack of 3 Stories in Height or 3 Intervals	Total for Stack	Total at One Story or Branch Interval
11/4	1	2	2	1
11/2	3	4	8	2
2	6	10	24	6
21/2	12	20	42	9
3	201	302	602	161
4	100	240	500	90
5	360	540	1,100	200
6	620	960	1,900	350
8	1,400	2,200	3,600	600
10	2,500	3,800	5,600	1,500
12	3,900	6,000	8,400	1,500
15	7,000	-	-	-

¹ Not over two water closets.

² Not over six water closets, or more than two per branch interval or per floor.

Ill. Admin. Code tit. 77, 890, Subpart M, Appendix A H